Electric motor

Abstract

To provide a technique to cool an entire stator more effectively than before.SOLUTION: An electric motor disclosed in the present specification includes a stator, a supply hole, a first flow passage, and a plurality of second flow passages. The stator is cylindrical. The first flow passage and the second flow passages are provided in the stator. The first flow passage extends along a circumferential direction of the stator. The second flow passages extend along an axis of the stator. The second flow passages cross the first flow passage. A plurality of refrigerant guides to disturb a flow of a refrigerant are provided in the first flow passage. The refrigerant is supplied from the supply hole to the first flow passage. The flow of the refrigerant supplied in the first flow passage is disturbed by the guides. A part of the refrigerant of which flow is disturbed flows into the second flow passages. The refrigerant is distributed by the guides into the second flow passages arranged in the circumferential direction of the stator. The refrigerant flows evenly into the second flow passages. The entire stator is thus effectively cooled.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The technology disclosed in this specification relates to an electric motor.

Background Art

[0002] An electric motor includes a stator and a rotor that rotates inside the stator. For simplicity of explanation hereinafter, "electric motor" will be simply referred to as "motor". The motor (electric motor) also includes a cooling structure for cooling the stator. Examples of structures for cooling the stator are disclosed in Patent Documents 1 - 3.

[0003] In the motor disclosed in Patent Document 1, a refrigerant flow path is provided on the outer peripheral surface of the stator. A plurality of guides are provided in the refrigerant flow path. The guides disrupt the flow of the refrigerant. As the refrigerant flows in various directions within the refrigerant flow path, the cooling efficiency for the stator is enhanced.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] This specification provides a technology for cooling the entire stator more effectively than before.

Means for Solving the Problems

[0006] The motor disclosed herein comprises a stator, a supply port, a first flow path, and a plurality of second flow paths. The stator surrounds the rotor. The first flow path and the plurality of second flow paths are provided in the stator. The first flow path extends in the circumferential direction of the stator. The plurality of second flow paths extend along the axis of the stator. The plurality of second flow paths intersect with the first flow path. The first flow path is provided with a plurality of refrigerant guides that disrupt the flow of the refrigerant.

[0007] The refrigerant is supplied from the supply port into the first flow path. The flow of the refrigerant supplied to the first flow path is disturbed by the guides. A portion of the disturbed refrigerant flows into the second flow path. The refrigerant is distributed by multiple guides into multiple second flow paths arranged circumferentially around the stator. Therefore, the refrigerant flows evenly through the multiple second flow paths. The entire stator is effectively cooled.

[0008] An example of a guide is a plate connected to the bottom and both sides of the first flow path. The area of ​​the plate is smaller than the cross-sectional area of ​​the first flow path. Within the first flow path, the guide plate directs some of the refrigerant to the second flow paths on the left and right. Since the area of ​​the guide is smaller than the area of ​​the first flow path, the remaining refrigerant flows beyond the guide and downstream of the first flow path.

[0009] The surface of the guide plate should be in contact with the inner surface of the second flow path. This allows some of the refrigerant that hits the guide to be smoothly guided into the second flow path.

[0010] The stator may be positioned so that its axis is horizontal. In this case, the supply port for supplying refrigerant to the first flow path may be located between the center height and the total height of the stator. In this case, it is preferable that the area of ​​the guide located below the point where the discharge direction of the refrigerant flowing out of the supply port intersects with the bottom of the first flow path (the intersection point) is larger than the area of ​​the guide located above the intersection point. Refrigerant flows more easily downwards than upwards from the supply port. By increasing the cross-sectional area of ​​the lower guide, the flow resistance on the lower side of the first flow path becomes greater than the flow resistance on the upper side. The refrigerant flows evenly both downwards and upwards from the intersection point.

[0011] It is preferable that multiple guides be provided at equal intervals around the stator. This can reduce the manufacturing cost of the stator, including the guides.

[0012] The multiple guides may be multiple projections protruding from the bottom surface of the first flow path. Alternatively, the multiple guides may have a wedge shape, narrower on the upstream side and wider on the downstream side in the direction of refrigerant flow within the first flow path. The guides extend toward the sides on both sides of the first flow path. The wedge-shaped guides guide a portion of the refrigerant in the first flow path to the second flow path while suppressing an increase in the flow resistance of the first flow path.

[0013] An example of the shape of the first channel is a groove provided on the outer surface of the stator. Another example of the shape of the second channel is a hole provided in the stator.

[0014] When the stator axis is positioned horizontally, it is desirable that the number of second flow channels located in the upper half of the stator be greater than the number of second flow channels located in the lower half of the stator. The second flow channels open at the ends of the stator. The refrigerant exiting the second flow channels located in the upper half of the stator flows down to the lower half of the stator. In other words, the refrigerant exiting the second flow channels located in the upper half of the stator also cools the lower half of the stator. Therefore, by placing more second flow channels in the upper half of the stator and fewer in the lower half, the stator can be cooled more effectively.

[0015] Details of the technology disclosed herein and further improvements are described in the following "Modes for Carrying Out the Invention". [Brief explanation of the drawing]

[0016] [Figure 1] This is a cross-sectional view of the motor according to the first embodiment. [Figure 2] Cross-sectional view of the motor cut along line II-II in Figure 1. [Figure 3] This figure shows a perspective view of the area within the dashed line III in Figure 2. [Figure 4] This is a perspective view illustrating the first variation. [Figure 5] It is a perspective view showing a guide of a second modification example. [Figure 6] It is a perspective view showing a guide of a third modification example. [Figure 7] It is a cross-sectional view of a motor of a second embodiment. [Figure 8] It is an enlarged view of the range V in FIG. 7. [Figure 9] It is a cross-sectional view of a motor of a third embodiment.

Modes for Carrying Out the Invention

[0017] (First Embodiment) The motor 2 of the first embodiment will be described with reference to the drawings. FIG. 1 shows a cross-sectional view of the motor 2. The motor 2 includes a rotor 6 and a stator 10. The stator 10 is cylindrical, and the axis of the stator 10 coincides with the axis of the rotor 6. For convenience of explanation, hereinafter, the axes of the stator 10 and the rotor 6 will be simply referred to as the "axis". The X direction of the coordinate system in the figure coincides with the direction of the axis. The +Z direction of the coordinate system in the figure corresponds to vertically upward.

[0018] The stator 10 is fixed inside the housing 3 of the motor 2. The stator 10 includes a stator core 11 and a coil 12. The stator core 11 is formed by laminating a plurality of electromagnetic steel sheets. The stator core 11 may be formed by applying pressure to magnetic iron powder to solidify it. The axial ends of the coil 12 are referred to as coil ends 12a and 12b. The coil ends 12a and 12b mean the axial ends of the coil 12 wound around the teeth of the stator core 11. The central portion of the coil 12 is located inside the stator core 11, but the coil ends 12a and 12b are exposed from the stator core 11. At the end of the stator core 11, the coil end 12a (12b) extends along the circumferential direction of the stator core 11. Alternatively, there may be a case where a plurality of coil end pieces are distributed in the circumferential direction of the stator core 11. In any case, the coil ends extend along the circumference of the stator core 11. In the figure, the stator core 11 is drawn in a simplified manner, and the illustration of the detailed structure of the stator 10 (such as the shape of the teeth and each winding of the coil) is omitted.

[0019] The rotor 6 is rotatably supported inside the housing 3 via bearings. The stator 10 surrounds the rotor 6. One end of the shaft of the rotor 6 extends outside the housing 3. The opening of the housing 3 and the shaft are sealed with a mechanical seal.

[0020] The stator 10 is cylindrical. The stator cover 20 covers the cylindrical stator 10. The stator cover 20 is also cylindrical and covers the outer periphery of the stator 10. A flow path 21 is provided in the stator cover 20. One end of the flow path 21 is connected to a flow path 5 described later. The other end of the flow path 21 opens to the inner surface of the stator cover 20.

[0021] Refrigerant 9 accumulates at the bottom of the housing 3. The pump 4 pumps up the refrigerant 9 from the bottom and supplies the refrigerant 9 to the flow path 21 of the stator cover 20. The refrigerant 9 is oil and cools the stator 10 and the rotor 6. The refrigerant 9 also serves as a lubricant for smoothly rotating the rotor 6. In FIG. 1, the pump 4 is arranged outside the housing 3, but the pump 4 may be arranged inside the housing 3.

[0022] A flow path 5 extends from the pump 4. The flow path 5 passes through the wall of the housing 3 and is connected to the flow path 21 that opens to the outer surface of the stator cover 20. As described above, one end of the flow path 21 opens to the inner surface of the stator cover 20. That opening is referred to as the supply port 22. The supply port 22 faces the outer surface of the stator core 11. A first flow path 14 is formed on the outer periphery of the stator core 11. The first flow path 14 goes around the cylindrical stator core 11. The supply port 22 opens toward the first flow path 14. A plurality of guides 16 are provided in the first flow path 14. The guides 16 will be described later.

[0023] The first flow path 14 consists of a groove encircling the outer circumference of the stator core 11 and a stator cover 20 covering the groove. The inner surface of the stator cover 20 covers the groove of the stator core 11. In the diagram, a gap is depicted between the outer surface of the stator core 11 and the inner surface of the stator cover 20. However, in reality, there is no gap, and the outer surface of the stator core 11 and the inner surface of the stator cover 20 are in contact. Therefore, refrigerant 9 does not leak from between the stator core 11 and the stator cover 20. The stator cover 20 may be considered as part of the stator 10.

[0024] The stator core 11 is provided with multiple second channels 15 extending along its axis. Each second channel 15 intersects with a first channel 14. That is, the first channel 14 and each second channel 15 are in communication. Both ends of the second channels 15 open to both ends of the stator core 11. The openings of the second channels 15 (openings at the ends of the stator core 11) are located near the coil ends 12a and 12b.

[0025] The refrigerant 9, pumped up by the pump 4, flows from the supply port 22 into the first flow path 14. The thick arrow line in Figure 1 represents the flow of the refrigerant 9. A guide 16 is provided in the first flow path 14, and the flow of the refrigerant 9 in the first flow path 14 is disturbed by the guide 16. A portion of the disturbed refrigerant 9 flows into the second flow path 15.

[0026] The refrigerant 9 that has flowed through the second flow path 15 is released from the openings at both ends of the second flow path 15. The refrigerant 9 released from the second flow path 15 falls onto the coil ends 12a and 12b, cooling them. Some of the refrigerant 9 flows from the coil ends 12a and 12b to the rotor 6, cooling it. As mentioned earlier, the refrigerant 9 lubricates the rotor 6.

[0027] Figure 2 shows a cross-section of motor 2 along the line II-II in Figure 1. In Figure 2, only the rotor 6, stator 10, and stator cover 20 are shown, and other parts (such as the housing 3) are not shown. Figure 2 shows a cross-section of the rotor 6, stator 10, and stator cover 20 cut along the first flow path 14.

[0028] The stator core 11 (stator 10) is provided with multiple second channels 15. As mentioned earlier, the second channels 15 extend along the axis (X-axis) and open at both ends of the stator core. The multiple second channels 15 are arranged at equal intervals along the circumference of the stator core 11. In other words, the multiple second channels 15 are evenly distributed along the circumference of the stator core 11.

[0029] As mentioned earlier, the first channel 14 is provided with multiple guides 16. Each guide 16 is located near each second channel 15. As shown in Figure 2, the multiple second channels 15 are arranged at equal intervals around the stator core 11, and the multiple guides 16 are also arranged at roughly equal intervals around the stator core 11. One guide 16 is placed between adjacent second channels.

[0030] Figure 3 is a perspective view of the structure within the area marked by dashed line III in Figure 2. The thick arrow lines represent the flow of the refrigerant.

[0031] Guide 16 is a plate connected to the bottom surface 14a and both sides 14b of the first flow path 14. The area of ​​guide 16, when viewed along the direction of refrigerant flow, is smaller than the cross-sectional area of ​​the first flow path. Therefore, some of the refrigerant flows over guide 16 and along the first flow path 14. The flow of the refrigerant is disturbed by guide 16, and the remaining refrigerant flows from the first flow path 14 to the second flow path 15. Although not visible in Figure 3, the second flow path 15 opens to both sides 14b of the first flow path 14, and the refrigerant flows into the second flow paths 15 on both sides of the first flow path.

[0032] Guide 16 is a plate, and its surface is connected to the inner surface 15a on the refrigerant-downstream side of the second flow path 15. In other words, the surface of guide 16 is flush with the inner surface 15a on the refrigerant-downstream side of the second flow path 15. A portion of the refrigerant that comes into contact with guide 16 is smoothly guided into the second flow path 15.

[0033] By providing multiple guides 16, the refrigerant is distributed into multiple second flow channels 15 arranged circumferentially around the stator core 11. Since the refrigerant is evenly distributed into the multiple second flow channels 15, the entire stator 10 is cooled uniformly. In other words, the motor 2 of this embodiment can effectively cool the stator 10.

[0034] As shown in Figure 1, the first flow path 14 is located in the center of the stator 10 in the axial direction. The refrigerant flows evenly from the first flow path 14 to the second flow paths 15 on both sides in the axial direction. The +Z direction means vertically upward, and the supply port 22 opens at the highest point of the stator core 11. The refrigerant supplied from the supply port 22 is evenly divided on both sides of the supply port 22 (both sides when viewed from the axial direction).

[0035] Furthermore, the coil ends 12a (12b) are located at the ends of the stator core 11 and extend along the circumference of the stator core 11. The refrigerant dispersed in the multiple second flow channels 15 falls out from the openings of the multiple second flow channels 15 and sprinkles over the entire coil ends 12a and 12b. Therefore, the motor 2 of the embodiment can efficiently cool the coil ends 12a and 12b as well.

[0036] Figure 4 shows the guide 116 of the first modified example. Figure 4 is a perspective view of Figure 3 with the guide 116 replaced by the guide 16. The guide 116 is also a plate and is connected to the bottom surface 14a and both sides 14b of the first flow channel 14. Similar to the multiple guides 16, the multiple guides 116 are arranged at roughly equal intervals in the circumferential direction of the stator core 11.

[0037] Guide 116 is provided with multiple holes 116a. A portion of the refrigerant flows through the multiple holes 116a along the first flow path 14. Another portion of the refrigerant flows beyond guide 116 along the first flow path 14. The remaining refrigerant is guided by guide 116 and flows into the second flow path 15. The area of ​​guide 116 when viewed along the direction of refrigerant flow is smaller than the cross-sectional area of ​​the first flow path 14. Guide 116 in the first modified example has the same effect as guide 16. Guide 116 may be made of a mesh instead of a plate.

[0038] Figure 5 shows the guide 216 of the second modified example. Figure 5 is a perspective view of Figure 3, with multiple guides 216 placed in place of multiple guides 16.

[0039] The guide 216 is made up of a plate bent at a sharp angle. The guide 216 is connected to the bottom surface 14a and both sides 14b of the first channel 14. Like the multiple guides 16, the multiple guides 216 are arranged at roughly equal intervals along the circumference of the stator core 11.

[0040] The guide 216 has a wedge shape. The wedge-shaped guide 216 is positioned so that it is narrower on the upstream side in the direction of refrigerant flow (thick arrow line in the figure) and wider on the downstream side. In other words, the guide 216 has a V shape. The tip of the V faces the upstream side of the refrigerant. The wedge-shaped guide 216 can smoothly guide some of the refrigerant to the second flow path 15 while suppressing the flow resistance of the first flow path 14.

[0041] In the first embodiment, the guide 16 and the wedge-shaped guide 216 do not necessarily have to be in contact with the side surface 14b of the first flow path 14. The sizes of the guides 16, 116, and 216 are determined considering the refrigerant distribution ratio between the first flow path 14 and the second flow path 15.

[0042] Figure 6 shows the guide 316 of the third modified example. Figure 6 is a perspective view similar to Figure 3, but with multiple guides 316 placed in place of multiple guides 16. The guides 316 are projections that protrude from the bottom surface 14a of the first flow path 14. The height and number of projections are determined considering the refrigerant distribution ratio between the first flow path 14 and the second flow path 15. The guides 316 of the third modified example have the same effect as the guides 16.

[0043] (Second Embodiment) The motor 102 of the second embodiment will be described with reference to Figures 7 and 8. Figure 7 is a cross-sectional view of the motor 102, and Figure 6 is an enlarged view of the area VIII enclosed by the dashed line in Figure 7. Figure 7 corresponds to Figure 2 of the first embodiment. Similar to Figure 2, only the rotor 6, stator 110, and stator cover 120 are shown in Figure 7, and other parts are omitted from the illustration.

[0044] The motor 102 comprises a stator 110 and a stator cover 120. A first flow path 14 is provided on the outer circumference of the stator core 111 (stator 110). Figure 7 shows a cross-section of the motor 102 cut along the first flow path 14.

[0045] The stator cover 120 surrounds the outer surface of the stator core 111. In Figure 7, a gap is depicted between the stator core 111 and the stator cover 120, but in reality, there is no gap. The first flow path 14 is composed of a groove provided on the outer surface of the stator core 111 and the inner surface of the stator cover 120 that covers the groove.

[0046] The stator core 111 (stator 110) is also provided with multiple second flow channels 15. The second flow channels 15 are holes that penetrate the stator core 111 in the axial direction. Each of the multiple second flow channels 15 intersects with the first flow channel 14. That is, each second flow channel 15 is in communication with the first flow channel 14.

[0047] Multiple guides 416 are provided in the first flow path. The guides 416 are plates connected to the bottom and both sides of the first flow path 14, similar to the guide 16 in the first embodiment. The multiple guides 416 are arranged along the circumference of the stator core 111. Similar to the guide 16, the guides 416 disrupt the flow of refrigerant in the first flow path 14 and guide a portion of the refrigerant to the second flow path 15.

[0048] The stator cover 120 is provided with a flow path 21, one end of which opens into the first flow path 14. This opening is referred to as the supply port 22. Refrigerant is supplied to the first flow path 14 from the supply port 22. In Figure 8, guides 416 located near the supply port 22 are denoted by reference numerals 416a and 416b.

[0049] In the coordinate system shown in the figure, the +Z direction corresponds to the vertically upward direction. The X and Y axes are oriented horizontally. The motor 102 is positioned so that the axis of the stator 110 is oriented horizontally. The X axis of the coordinate system shown in the figure coincides with the axis. The refrigerant supply port 22 is located vertically between the center height H1 and the total height H2 of the stator 110. In Figure 8, the height H3 of the supply port 22 is higher than the center height H1 and lower than the total height H2.

[0050] The refrigerant supplied from the supply port 22 to the first flow path 14 splits into two flows. If the position of the supply port 22 is lower than the total height H2, one flow goes downwards from the supply port 22, and the other flow goes upwards from the supply port 22. The thick arrow lines in Figure 8 represent the flow of the refrigerant.

[0051] In Figure 8, the point where the discharge direction of the refrigerant flowing out of the supply port 22 (dashed arrow) intersects with the bottom of the first flow path 14 is called the intersection point P. As shown in Figure 8, of the guides 416a and 416b close to the supply port 22, the height of guide 416a located below the intersection point P is greater than the height of guide 416b located above the intersection point P. Since the widths of guides 416a and 416b are the same, the area of ​​guide 416a located below the intersection point P is larger than the area of ​​guide 416b located above the intersection point P. With such a structure, the flow resistance of the first flow path 14 below the intersection point P becomes greater than the flow resistance of the first flow path 14 above the intersection point P. Therefore, the refrigerant flows evenly to the lower and upper sides of the supply port 22. Even if the supply port 22 is located lower than the total height H2 of the stator 110, the refrigerant flows evenly through the first flow path 14. Therefore, the stator 110 is effectively cooled, and furthermore, the entire coil ends 12a and 12b are also effectively cooled.

[0052] (Third Embodiment) Figure 9 shows a cross-sectional view of the motor 202 of the third embodiment. Figure 9 corresponds to Figure 2 of the first embodiment. Similar to Figure 2, only the rotor 6, stator 210, and stator cover 220 are shown in Figure 9, and other parts are omitted from the illustration.

[0053] In the coordinate system shown in the diagram, the +Z direction indicates vertically upward. The X and Y axes are horizontal. Motor 202 is positioned so that the axis of the stator 210 is oriented horizontally.

[0054] The stator 210 comprises a first flow path 14 and a plurality of second flow paths 15. The first flow path 14 extends along the outer circumference of the cylindrical stator core 211. The first flow path 14 is arranged to encircle the stator core 211. The plurality of second flow paths 15 extend along the axis of the stator 210, and each second flow path 15 intersects with the first flow path 14. Each second flow path 15 communicates with the first flow path 14. The first flow path 14 is provided with a plurality of guides 16. The guides 16 direct a portion of the refrigerant from the first flow path 14 to the second flow paths 15.

[0055] The dashed line HL in Figure 9 is a horizontal line passing through the center of the stator 210. The number of second channels 15 located in the upper half of the stator core 211 (stator 210) is greater than the number of second channels 15 located in the lower half of the stator core 211 (stator 210). The second channels 15 open at both ends of the stator core 211.

[0056] The refrigerant exiting the opening of the second flow path 15 falls vertically downward. The refrigerant exiting the second flow path 15 located in the upper half of the stator 210 falls onto the lower half of the stator 210. In other words, the refrigerant exiting the second flow path 15 located in the upper half of the stator 210 also cools the lower half of the stator 210. Therefore, by arranging many second flow paths 15 in the upper half of the stator 210 and fewer second flow paths in the lower half, the stator 210 can be cooled more effectively.

[0057] Furthermore, some of the refrigerant that exits from the second flow path 15 located in the upper half of the stator 210 also flows to the coil ends 12a and 12b located in the lower half of the stator 210. The motor 202 can effectively cool the coil ends 12a and 12b that extend circumferentially at the ends of the stator 210.

[0058] As described above, the motor 2 (102, 202) equipped with a first flow path 14, a plurality of second flow paths 15, and a plurality of guides 16 (116, 216, 316, 416) can effectively cool the entire stator 10 (110, 210).

[0059] The following points concern the technology disclosed herein. The stator 10 (110, 210) comprises a cylindrical stator core 11 (111, 211) and coil ends 12a, 12b located at both ends of the stator core 11 (111, 211) in the axial direction. The first flow path 14 extends along the outer circumference of the stator core 11 (111, 211) and encircles the circumference.

[0060] Multiple second channels 15 extend parallel to the axis of the stator 10 (110, 210) and open at both ends of the stator core 11 (111, 211). Multiple second channels 15 may be arranged in a spiral around the axis of the stator core 11 (111, 211). Curved second channels are longer than straight second channels, allowing for more effective cooling of the stator 10 (110, 210).

[0061] Guides 16 (116, 216, 316, 416) may be part of the stator 10 (110, 210) or may be separate parts from the stator 10 (110, 210). Guides 16 (116, 216, 316, 416) may be made of the same material as the stator 10 (110, 210) or may be made of a different material than the stator 10 (110, 210). If the stator core is a laminate of multiple electrical steel sheets, the guides may be protrusions provided on the electrical steel sheets.

[0062] Multiple guides arranged at equal intervals around the stator core can be manufactured at lower costs than multiple guides that are unevenly distributed around the stator core. Multiple guides arranged at equal intervals are easier to manufacture than multiple guides that are unevenly distributed around the stator.

[0063] In the motor of this embodiment, the refrigerant is supplied to the first passage 14 through a passage 21 that passes inside the stator cover 20 (120, 220). The first passage may be a hole provided inside the stator core 11 (111, 211). The passage that leads the refrigerant to the first passage may be a separate pipe provided inside the housing, rather than inside the stator cover. Alternatively, the passage that leads the refrigerant to the first passage may be provided inside the housing.

[0064] Although specific examples of the present invention have been described in detail above, these are merely illustrative and do not limit the scope of the claims. The technologies described in the claims include various modifications and changes to the specific examples illustrated above. The technical elements described in this specification or drawings exhibit technical usefulness individually or in various combinations, and are not limited to the combinations described in the claims at the time of filing. Furthermore, the technologies illustrated in this specification or drawings can achieve multiple objectives simultaneously, and achieving even one of these objectives itself constitutes technical usefulness. [Explanation of symbols]

[0065] 2, 102, 202: Motor 3: Housing 4: Pump 5: Flow path 6: Rotor 9: Refrigerant 10, 110, 210: Stator 11, 111, 211: Stator core 12: Coil 12a, 12b: Coil end 14: First flow path 15: Second flow path 16, 116, 216, 316, 416, 416a, 416b: Guide 20, 120, 220: Stator cover 21: Flow path 22: Supply port

Claims

1. The stator surrounds the rotor, A first flow channel is provided in the stator and extends in the circumferential direction of the stator, A supply port for supplying refrigerant to the first flow path, A plurality of second channels are provided in the stator, extend along the axis of the stator, and intersect with the first channel, A plurality of guides are provided within the first flow path and disrupt the flow of refrigerant within the first flow path, A coil end exposed at the end of the stator in the direction along the aforementioned axis, It is equipped with, The area of ​​the guide, when viewed along the direction of the flow of the refrigerant, is smaller than the cross-sectional area of ​​the first flow path. The second flow path is open at the end of the stator, and the refrigerant flows from the first flow path to the second flow path and is discharged from the opening toward the coil end. Electric motor.

2. The electric motor according to claim 1, wherein the guide is a plate connected to the bottom surface and both sides of the first flow path.

3. The electric motor according to claim 2, wherein the surface of the guide is in contact with the inner surface of the second flow path.

4. The stator is positioned such that its axis is horizontal. The supply port is located between the center height and the total height of the stator, The electric motor according to claim 2, wherein the area of ​​the guide located below the intersection point where the discharge direction of the refrigerant flowing out from the supply port intersects with the bottom of the first flow path is larger than the area of ​​the guide located above the intersection point.

5. The electric motor according to any one of claims 2 to 4, wherein the plurality of guides are provided at equal intervals in the circumferential direction of the stator.

6. The electric motor according to claim 1, wherein the guide is a projection protruding from the bottom surface of the first flow path.

7. The electric motor according to claim 1, wherein the guide has a wedge shape that is narrow on the upstream side and wide on the downstream side in the flow direction of the refrigerant in the first flow path.

8. The electric motor according to claim 1, wherein the first flow path is a groove provided on the outer circumferential surface of the stator.

9. The electric motor according to claim 1, wherein the second flow path is a hole provided in the stator.

10. The stator is positioned such that its axis is horizontal. The number of second flow channels located in the upper half of the stator is greater than the number of second flow channels located in the lower half of the stator. The electric motor according to claim 1.

Images